As anyone who has ever had a drink knows, alcohol has an immediate impact on the brain. But what do we know about how much is too much, and the surprising connection between alcohol consumption and traumatic brain injury? For the latest findings, we speak with Dr. John Corrigan, professor in the Department of Physical Medicine and Rehabilitation at The Ohio State University Wexner Medical Center and director of the Ohio Valley Center for Brain Injury Prevention and Rehabilitation, and with Dr. Zach Weil, an assistant professor at The Ohio State University in the Department of Neuroscience.